# Dead Code Cleanup Report

## Overview

This document records the dead code cleanup work performed on the spear-next project, aimed at improving code quality, reducing maintenance burden, and optimizing compilation performance.

## 2026-05 Cleanup (Repository Hygiene)

### Changes
- Removed unused direct dependency `tonic-web` from `Cargo.toml`.
- Updated GitHub release workflow to remove obsolete Go/Python/FlatBuffers steps and to upload the actual build outputs:
  - `target/release/spearlet`
  - `target/release/sms`
- Removed unused placement decision tracking state (kept `decision_id` as a lightweight correlation token).
- Removed an unused duplicate `resolve_spearlet_ws_url` implementation from the endpoint gateway.
- Cleaned MCP registry sync cursor handling to avoid redundant initialization.
- Reduced errno exports to the minimal set actually used by host APIs (and kept test-only aliases behind `cfg(test)`).
- Removed redundant client initializations and obvious unused variables in tests/examples.

### Verification
- `cargo check`: ✅ no warnings
- `make build`: ✅ passed
- `make test`: ✅ passed

## Cleanup Details

### 1. Unused Import Cleanup

#### Cleaned Files:
- `src/network/grpc.rs`: Removed unused imports: `Layer`, `ServiceBuilder`, `TraceLayer`, `Span`, `error`, `Server`, `HealthReporter`
- `src/network/http.rs`: Removed `ServiceBuilder` import
- `src/sms/services/resource_service.rs`: Removed `create_kv_store`, `KvStoreType` imports
- `src/sms/http_gateway.rs`: Removed `Router` import
- `src/sms/service.rs`: Removed `KvStore`, `DateTime` imports
- `src/sms/mod.rs`: Removed `config::*` import
- `src/spearlet/object_service.rs`: Removed `uuid::Uuid`, `SmsError` imports
- `src/spearlet/grpc_server.rs`: Removed `Request`, `Response`, `Status` imports
- `src/spearlet/http_gateway.rs`: Removed `Serialize` import
- `src/lib.rs`: Removed `proto::*` import
- `src/config/mod.rs`: Removed `std::time::Duration`, `tracing::{info, warn}` imports

### 2. Unused Variables and Fields Cleanup

#### Removed Struct Fields:
- `GrpcClientManager.timeout`: This field was stored in the struct but never used

#### Removed Function Parameters:
- `SmsServiceImpl::with_storage_config()`: Removed unused `heartbeat_timeout` parameter

#### Renamed Variables:
- `src/network/grpc.rs`: Renamed unused variables to `_health_service`, `_ca`, `_ca_cert`, `_tls` to avoid warnings

### 3. Unused Structs and Configuration Cleanup

#### Removed Structs:
- `network::NetworkConfig`: Removed duplicate network configuration struct, kept `config::NetworkConfig`
- `network::GrpcServerConfig`: Unused gRPC server configuration
- `network::HttpServerConfig`: Unused HTTP server configuration  
- `network::TlsConfig`: Unused TLS configuration
- `network::ClientConfig`: Unused client configuration
- `GrpcServerBuilder`: Completely removed unused gRPC server builder and all its methods

### 4. Resolved Compilation Warnings

#### Warnings Before Cleanup:
- Total: ~14+ compilation warnings

#### Status After Cleanup:
- ✅ 0 compilation warnings
- ✅ Successful compilation with no errors
- ✅ Resolved ambiguous glob re-export warnings

## Impact Analysis

### Positive Impact:
1. **Improved Compilation Performance**: Reduced unnecessary dependency compilation
2. **Better Code Readability**: Removed confusing imports and unused code
3. **Lower Maintenance Cost**: Reduced amount of code to maintain
4. **Resolved Type Conflicts**: Fixed duplicate `NetworkConfig` definition issue

### Risk Assessment:
- ✅ **Low Risk**: All removed code was carefully verified to be unused
- ✅ **Backward Compatible**: No impact on existing public APIs
- ✅ **Feature Complete**: No impact on any existing functionality

## Recommendations

### Continuous Maintenance:
1. Regularly run `cargo check --workspace` to check for new dead code
2. Pay attention to unused imports and variables during code reviews
3. Consider using `cargo clippy` for stricter code quality checks

### Tool Recommendations:
```bash
# Check for dead code
cargo check --workspace

# Stricter checks
cargo clippy --workspace

# Auto-fix some issues
cargo fix --workspace --allow-dirty
```

## Summary

This dead code cleanup work successfully:
- Cleaned unused imports from 15+ files
- Removed 5+ unused structs and configurations  
- Resolved all compilation warnings
- Improved code quality and maintainability

---

**Cleanup Date**: January 2024
**Performed By**: AI Assistant
**Verification Status**: ✅ Verified successful compilation
